web2
GFSJ0627积分 2金币 2
91最佳Writeup由 Robert_Wei 提供
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难度：2
方向：Web
题解数：108
解出人数：10185
题目来源: CTF
题目描述:
解密
题目场景:
100%
倒计时: 3时59分18秒
<?php
$miwen="a1zLbgQsCESEIqRLwuQAyMwLyq2L5VwBxqGA3RQAyumZ0tmMvSGM2ZwB4tws";
function encode($str){
$_o=strrev($str);
// echo $_o;
for($_0=0;$_0<strlen($_o);$_0++){
$_c=substr($_o,$_0,1);
$__=ord($_c)+1;
$_c=chr($__);
$_=$_.$_c;
}
return str_rot13(strrev(base64_encode($_)));
}
highlight_file(__FILE__);
/*
逆向加密算法，解密$miwen就是flag
*/
?>get the flag
`
<?php
$miwen="a1zLbgQsCESEIqRLwuQAyMwLyq2L5VwBxqGA3RQAyumZ0tmMvSGM2ZwB4tws";
echo $miwen;
function encode($str){
$_o=strrev($str);
echo $_o;
for($_0=0;$_0<strlen($_o);$_0++){
$_c=substr($_o,$_0,1);
$__=ord($_c)+1;
$_c=chr($__);
$_=$_.$_c;
}
return str_rot13(strrev(base64_encode($_)));
}
//highlight_file(__FILE__);
/*
逆向加密算法，解密$miwen就是flag
*/
echo "\n";
echo "test:";
echo encode("123");
$str = "Uryyb Jbeyq!";
$str_rot13 = str_rot13($str);
echo "\n";
echo $str_rot13; // 输出 "Hello World!"
echo "\n";
echo str_rot13($miwen);
echo "\n";
echo strrev(str_rot13($miwen));
echo "\n";
echo base64_decode( strrev(str_rot13($miwen)) );
$_o=base64_decode( strrev(str_rot13($miwen)) );
for($_0=0;$_0<strlen($_o);$_0++){
$_c=substr($_o,$_0,1);
$__=ord($_c)-1;
$_c=chr($__);
$_=$_.$_c;
}
echo "\n";
echo $_;
echo "\n";
echo strrev($_);
?>`
using vscode
a1zLbgQsCESEIqRLwuQAyMwLyq2L5VwBxqGA3RQAyumZ0tmMvSGM2ZwB4tws
test:321lZQA
Hello World!
n1mYotDfPRFRVdEYjhDNlZjYld2Y5IjOkdTN3EDNlhzM0gzZiFTZ2MjO4gjf
fjg4OjM2ZTFiZzg0MzhlNDE3NTdkOjI5Y2dlYjZlNDhjYEdVRFRPfDtoYm1n
~88:36e1bg8438e41757d:29cgeb6e48c`GUDTO|;hbmg
}77925d0af7327d30646c918bfda5d37b_FTCSN{:galf
flag:{NSCTF_b73d5adfb819c64603d7237fa0d52977}